... 5CT,API 5CT.5B,GB/T9711.1,GB/T9711.2-99 ect Material :J55,K55,N80 ect Product Name:pipe for oil field1,Outer ... Diameter:73mm-630mm2,Thickness:5-30mm3,Application:For line pipe in petroleum and natural gas4,Quality:First grade5, ... , China(Mainland)StandardAPI 5L,API 5CT,API 5CT.5B,GB/T9711.1,GB/T9711.2-99 ectMaterialJ55,K55,N80,L80,N80,P11,P91 ...